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Malcolm Watts wrote to the list:
> Be aware that the high voltage winding can exhibit resonances
> (well both do actually) but the resonance/s in the secondary
> can occur near the test frequency due to the large inductance
> and self-capacitance in the secondary and if this winding is
> loaded merely with a scope probe i.e a megohm and a few pF,
> its Q can be quite high.
This could be the reason for the difficulties in determining the
voltage radio and explain why I've found clear differences between
measuring "forward" and measuring "backward".